Based on the findings of this paper, several recommendations can be made:
For beginners, try first:
The search for " s12 bitdownload ir hot " suggests this is likely a specific download link or a technical identifier for software hosted on the Iranian software portal BitDownload.ir s12 bitdownload ir hot
If the treble feels too "hot" for your taste, many "good write-ups" suggest using foam ear tips or a slight EQ reduction around the 8kHz peak to smooth out the sound. EQ settings for these IEMs? Based on the findings of this paper, several